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| Subject: | Re: Not constant sha1sum |
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| Date: | Mon, 17 Sep 2007 13:18:52 +0200 |
Hello All, Thanks for all your good advices. The issue is probably a bad hardware. File are stored on a EXT3 partition on a server running Linux Fedora. When I compute with Linux (through ssh, then with server resources) I have a bad result. When I compute these same files situated on the same server with Windows (through Samba, then with desktop resources) I have a good result. As a conclusion I would say "Never trust one hash only. Forensic good practice require two equal hash coming from two different ways" At 10:33 08/09/07 +0200, LERTI - Paul Vidonne wrote:
Hello all ! Does smb met the following issue : several hash for an unique file ? Of course a big one (4 GB). OS is Linux Fedora. File system EXT3 mounted on a SATA RAID-5 on Adaptec card Could you enlighten me ? Exemple : [root@spica acquisit]# sha1sum -b 07667-SDH-dd.001 fe8195547af6d7ce76cd2e44160e06310a964063 *07667-SDH-dd.001 [root@spica acquisit]# sha1sum -b 07667-SDH-dd.001 e8dde55722ed1f2424fd7bb6246163120c561927 *07667-SDH-dd.001 [root@spica acquisit]# sha1sum -b 07667-SDH-dd.001 65f5eb98d33f7ccb1a8a82b0e6d916921c9d97b9 *07667-SDH-dd.001 The best is that the second hash is the good one ! Truly yours, Paul Vidonne -- LERTI - Laboratoire d'Expertise et de Recherche de Traces Informatiques http://www.lerti.fr +33.4 76 90 54 21
-- Paul Vidonne Consultant 16, chemin de Malacher 38240 Meylan Tel : +33 4 76 90 65 97 http://www.vidonne.fr
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